Yii2 find one

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ActiveRecord is the base class for classes representing relational data in terms of objects. Active Record implements the Active Record design pattern. The object's attributes are mapped to the columns of the corresponding table. Referencing an Active Record attribute is equivalent to accessing the corresponding table column for that record. As an example, say that the Customer ActiveRecord class is associated with the customer table. This would mean that the class's name attribute is automatically mapped to the name column in customer table. In this example, Active Record is providing an object-oriented interface for accessing data stored in the database.

Yii2 find one

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I discovered this recently when I noticed performance degradation on large datasets. This may seem insignificant, but according to how indexes work, it may cause huge performance degradation on large datasets. The reason is, that SQL in [1] will not stop column scan when founds first match and will continue until whole column scanned. On tables with millions of records this has significant negative performance impact. So variant [1] works flawlessly only on columns with primary or unique indexes , where the ID uniqueness is guaranteed. It performs badly on columns with common KEY indexes because uniqueness cannot be guaranteed. However, since the method name one or findOne suggests it will return only one first match it makes no sense to continue scanning after matching first record.

See getErrors for detailed description.

Active Record provides an object-oriented interface for accessing and manipulating data stored in databases. An Active Record class is associated with a database table, an Active Record instance corresponds to a row of that table, and an attribute of an Active Record instance represents the value of a particular column in that row. Instead of writing raw SQL statements, you would access Active Record attributes and call Active Record methods to access and manipulate the data stored in database tables. For example, assume Customer is an Active Record class which is associated with the customer table and name is a column of the customer table. You can write the following code to insert a new row into the customer table:.

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. I'm new to Yii and I've been just changing default User class to make it depend on database rather than on static attribute.

Yii2 find one

The latter is invoked by the former implicitly when you call one of the query methods. All the query building methods return the query object itself, which allows you to chain multiple calls together. You can specify columns to be selected in either an array or a string, like the following. The column names being selected will be automatically quoted when the SQL statement is being generated from a query object. For example,. If you are using the array format to specify columns, you can also use the array keys to specify the column aliases.

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When overriding this method, make sure you call the parent implementation so that the event is triggered. See also attachBehavior. Whether the property value is null. The insert operation. Edit it on github! I think this page require a section may be titled as " Updating Relations " that shows standard ways to update relational data specially for Many to Many relationships via the junction table. This would mean that the class's name attribute is automatically mapped to the name column in customer table. We can add a relation to the Customer class that lists all items from all the orders they placed, and name it getPurchasedItems , the chaining of relations is show in the following code example:. If not set, formName is used. Whether the attribute is required. Note that this method requires that the primary key value is not null. This method will validate every model. The usage of relations declared with a junction table is the same as that of normal relations.

These methods can be chained together.

Note that for composite primary keys, an array will always be returned regardless of this parameter value. If false is returned, the validation will stop and the model is considered invalid. Found a typo or you think this page needs improvement? Returns a value indicating whether the attribute is active in the current scenario. Null is returned if no error. Tip: You may also use the Gii code generator to generate ActiveRecord classes from your database tables. Whether to perform validation calling validate before saving the record. If the latter, the corresponding attribute values will be modified accordingly. If true , the return value will be an array with column names as keys and column values as values. The data to be passed to the event handler when the event is triggered. You may use the same technique in Active Record. That this method will automatically call the one method and return an ActiveRecord instance.